Add complete local development stack

hack/docker-compose.yml

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+version: "3.8"
+services:
+  mqtt2prometheus:
+    build:
+      context: ../
+      dockerfile: Dockerfile
+    volumes:
+      - type: bind
+        source: ./mqtt2prometheus.yaml
+        target: /config.yaml
+  mosquitto:
+    image: eclipse-mosquitto:1.6.9
+    ports:
+    - 1883:1883
+    - 9001:9001
+  prometheus:
+    image: prom/prometheus:v2.18.1
+    ports:
+    - 9090:9090
+    volumes:
+      - type: bind
+        source: ./prometheus.yml
+        target: /etc/prometheus/prometheus.yml

hack/mqtt2prometheus.yaml

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+# Settings for the MQTT Client. Currently only these three are supported
+mqtt:
+  # The MQTT broker to connect to
+  server: tcp://mosquitto:1883
+  # Optional: Username and Password for authenticating with the MQTT Server
+  # user: bob
+  # password: happylittleclouds
+  # The Topic path to subscripe to. Actually this will become `$topic_path/+`
+  topic_path: v1/devices/me
+  # The MQTT QoS level
+  qos: 0
+cache:
+  # Timeout. Each received metric will be presented for this time if no update is send via MQTT
+  timeout: 2m
+# This is a list of valid metrics. Only metrics listed here will be exported
+metrics:
+  # The name of the metric in prometheus
+  - prom_name: temperature
+    # The name of the metric in a MQTT JSON message
+    mqtt_name: temperature
+    # The prometheus help text for this metric
+    help: DHT22 temperature reading
+    # The prometheus type for this metric. Valid values are: "gauge" and "counter"
+    type: gauge
+    # A map of string to string for constant labels. This labels will be attached to every prometheus metric
+    const_labels:
+      sensor_type: dht22
+    # The name of the metric in prometheus
+  - prom_name: humidity
+    # The name of the metric in a MQTT JSON message
+    mqtt_name: humidity
+    # The prometheus help text for this metric
+    help: DHT22 humidity reading
+    # The prometheus type for this metric. Valid values are: "gauge" and "counter"
+    type: gauge
+    # A map of string to string for constant labels. This labels will be attached to every prometheus metric
+    const_labels:
+      sensor_type: dht22
+    # The name of the metric in prometheus
+  - prom_name: heat_index
+    # The name of the metric in a MQTT JSON message
+    mqtt_name: heat_index
+    # The prometheus help text for this metric
+    help: DHT22 heatIndex calculation
+    # The prometheus type for this metric. Valid values are: "gauge" and "counter"
+    type: gauge
+    # A map of string to string for constant labels. This labels will be attached to every prometheus metric
+    const_labels:
+      sensor_type: dht22
+  - prom_name: state
+    # The name of the metric in a MQTT JSON message
+    mqtt_name: state
+    # The prometheus help text for this metric
+    help: Light state
+    # The prometheus type for this metric. Valid values are: "gauge" and "counter"
+    type: gauge
+    # A map of string to string for constant labels. This labels will be attached to every prometheus metric
+    const_labels:
+      sensor_type: ikea
+    # When specified, enables mapping between string values to metric values.
+    string_value_mapping:
+      # A map of string to metric value.
+      map:
+        off: 0
+        low: 0
+      # Metric value to use if a match cannot be found in the map above.
+      # If not specified, parsing error will occur.
+      error_value: 1

hack/prometheus.yml

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+global:
+  scrape_interval: 15s
+  scrape_timeout: 10s
+  evaluation_interval: 15s
+alerting:
+  alertmanagers:
+    - static_configs:
+        - targets: []
+      scheme: http
+      timeout: 10s
+      api_version: v1
+scrape_configs:
+  - job_name: prometheus
+    honor_timestamps: true
+    scrape_interval: 15s
+    scrape_timeout: 10s
+    metrics_path: /metrics
+    scheme: http
+    static_configs:
+      - targets:
+          - localhost:9090
+  - job_name: mqtt2prometheus
+    honor_timestamps: true
+    scrape_interval: 15s
+    scrape_timeout: 10s
+    metrics_path: /metrics
+    scheme: http
+    static_configs:
+      - targets:
+          - mqtt2prometheus:8002